source: last-defense/main/Shield.java

package main;

import java.util.Iterator;
import java.util.LinkedList;
import gamegui.Animation;

public class Shield extends Unit {
    int radius;
    
    public Shield(final String name, final Animation img, final int hitpoints, final int radius) {
        super(name, img, hitpoints);
        this.radius = radius;
        this.actions.add(new Action.Defend(5L));
    }
    
    @Override
    public void perform(final Action action, final LinkedList<Entity> lstObjects, final LinkedList<Unit> lstTargets) {
        if (action instanceof Action.Defend) {
            this.perform((Action.Defend)action, lstObjects, lstTargets);
        }
    }
    
    public void perform(final Action.Defend action, final LinkedList<Entity> lstObjects, final LinkedList<Unit> lstTargets) {
        for (final Entity cur : lstObjects) {
            if (cur instanceof Projectile && !(((Projectile)cur).getTarget() instanceof Ship) && this.loc.distance(cur.loc) <= this.radius && !((Projectile)cur).exploded) {
                ((Projectile)cur).exploded = true;
                ((Projectile)cur).timeExploded = System.currentTimeMillis();
                this.takeDamage(((Projectile)cur).getDamage());
                if (this.getHitpoints() != 0) {
                    continue;
                }
                this.remove = true;
            }
        }
    }
}